4Y1I:
reference: Mn(2+)-Sensing Mechanisms of yybP-ykoY Orphan Riboswitches., Price IR, Gaballa A, Ding F, Helmann JD, Ke A, Mol Cell. 2015 Mar 19;57(6):1110-23. doi: 10.1016/j.molcel.2015.02.016. PMID: 25794619

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